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Get Free AccessAn ion-exchange process can be an effective route to synthesize new quasi-equilibrium phases with a desired crystal structure. Important layered-type battery materials, such as LiMnO2 and LiNi(0.5)Mn(0.5)O2, can be obtained through this method from a sodium-containing parent structure, and they often show electrochemical properties remarkably distinct from those of their solid-state synthesized equivalents. However, while ion exchange is generally believed to occur via a simple topotactic reaction, the detailed phase transformation mechanism during the process is not yet fully understood. For the case of layered LiNi(0.5)Mn(0.5)O2, we show through ex situ X-ray diffraction (XRD) that the ion-exchange process consists of several sequential phase transformations. By a study of the intermediate phase, it is shown that the residual sodium ions in the final structure may greatly affect the electrochemical (de)lithiation mechanism.
Hyeokjo Gwon, Sung‐Wook Kim, Young‐Uk Park, Jihyun Hong, Gerbrand Ceder, Seokwoo Jeon, Kisuk Kang (2014). Ion-Exchange Mechanism of Layered Transition-Metal Oxides: Case Study of LiNi<sub>0.5</sub>Mn<sub>0.5</sub>O<sub>2</sub>. , 53(15), DOI: https://doi.org/10.1021/ic501069x.
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Type
Article
Year
2014
Authors
7
Datasets
0
Total Files
0
Language
en
DOI
https://doi.org/10.1021/ic501069x
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